26 PEOCEEDIK'GS OF THE NATIONAL MUSEUM vol 75 



females. The latter series differs from one from Sumatra and the 

 mainland in l)eing more golden on the posterior lower parts; on an 

 average, vieAved in series, the back is deeper, not quite so greenish 

 yellow. I can detect no difference in the color of the rump betAveen 

 Mentawi and the Sumatra-Mainland series, however. There are 

 individual specimens in the tAvo series that can hardly be told apart, 

 but on the Avhole there is a good average difference. There is an 

 immature specimen in the National Museum from North Pagi Island 

 and tAvo females from Nias Island that I would assign also to 

 chrysophorus. 



Brachypodius melanoceflialus hypereinus (Oberholser) from 

 Simalur Island is a very well marked form, with a larger bill than 

 either atriceps or chrysopliot^s and on an average is also darker on 

 the chest and back. 



In this species the sexes are similar but the female aA^erages slightly 

 smaller, has a shorter bill, and is greener not so yellowish on the 

 back and chest. 



Three males from Sumatra (2) and Banka (1), measure: "Wing, 76-79 



(77.5) ; culmen, 13.5-14 (13.8) mm. 



Three males from Trong, Peninsular Siam : AA'ing, 78.5-82.5 (79.2); 



culmen, 13.5-14 (13.8) mm. 

 Five males from South Pagi Island: Wing, 76.5-80 (77.8); culmen, 



14-14.5 (14.4). 

 Three males from Sipora: Wing, 73.5-78.5 (75.3) ; culmen, 13.5-14 (13.8). 

 Four males from Siberut : Wing, 73.5-79 (75.4) ; culmen, 13.5-14 (13.8). 

 Ten males from Simalur: Wing, 77-82 (79.1) ; culmen, 14.5-15.5 (14.8). 



MICROTARSUS MELANOLEUCOS PROXIMUS Riley 



Microtarsus melanoleucos proximus Riley, Proc. Biol. Soc. Washington, vol. 



40, 1927, p. 96 (Siberut Island). 

 Microtarsus melanoleucus Chasen and Kloss, Ibis, 1926, p. 290. 



Four males and three females, Siberut. 



The female in this species differs from the male in slightly smaller 

 size and the more brownish, less blackish tone of the plumage. Com- 

 paring the four males from Siberut with one male from Malacca and 

 two from Borneo, the first mentioned series is much deeper black, 

 with little or no brownish shade. The females from Siberut are 

 more like the males from Borneo and may only with difficulty be 

 distinguished. Tlie females from Borneo are more brownish than 

 those from Siberut and could hardly be called blackish at all. I 

 can detect no difference worthy of note betAveen the single male from 

 Malacca and those of Borneo. 



Four males from Siberut measure: Wing, 82-88 (84.6) ; culmen, 14-15 



(14.6) mm. 



One male from Malacca and two from Borneo, measure : Wing, 84.5- 

 85.5 (84.8) ; culmen, 15-15.5 (15.2) mm. 



